package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.commonutils.exception.GuliException;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

/**
 * @author ran
 * @creat
 */
//因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //不能实现数据库操作   为什么？
    public EduSubjectService subjectService;

    public SubjectExcelListener() {

    }
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }


    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        //一行一行的读
        if (subjectData == null){
            throw new GuliException(20001,"文件不能没有内容");
        }
        String oneSubjectName = subjectData.getOneSubjectName();
        EduSubject existOneSubject = this.existOneSubject(subjectService, oneSubjectName);
        if (existOneSubject == null){
           existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(oneSubjectName);
            subjectService.save(existOneSubject);
        }
        //获取一级分类id值
        String pid = existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        String existTwoSubjectName = subjectData.getTwoSubjectName();
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, existTwoSubjectName, pid);
        if (existTwoSubject == null){
           existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(existTwoSubjectName);
            subjectService.save(existTwoSubject);
        }

    }

    //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
    //判断一级分类是否重复
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }
    //判断二级分类是否重复
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
